extract method: allow to extract from fragment with different exit points which all are @NotNull

java/java-tests/testData/refactoring/extractMethod/ExitPoints4Nullable.java

@@ -0,0 +1,12 @@
+class Test {
+    Integer method() {
+         <selection>try {
+             if(cond1) return 0;
+             else if(cond2) return null;
+             System.out.println("Text");
+         } finally {           
+             doSomething();
+         }</selection>
+         return 12;
+    }
+}

java/java-tests/testData/refactoring/extractMethod/ExitPoints4_after.java

@@ -0,0 +1,21 @@
+import org.jetbrains.annotations.Nullable;
+
+class Test {
+    int method() {
+        Integer x = newMethod();
+        if (x != null) return x;
+        return 12;
+    }
+
+    @Nullable
+    private Integer newMethod() {
+        try {
+            if(cond1) return 0;
+            else if(cond2) return 1;
+            System.out.println("Text");
+        } finally {           
+            doSomething();
+        }
+        return null;
+    }
+}